Stoker-grate.



F. J. HEIVIMLEIN.

STOKER GRATE.

APPLICATION FILED FEB. 2, I9I8.

l 9 @Q39 Q32 )l Patented Apr. 29, 1919.

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specification er Letters raient. yrmmwg A g@ '19o nppleatioaled February 2, 19125. Serial No. ma-da.

To aZZ wwm it may concern:

Be it known that l, FRANK d. RnMMLniN, a citizen of the United States, residin at Philadelphia, in the county of Fhiladelp ia, State of Pennsylvania, have invented a new and useful Stoker-Grate, of which the 'iollowing is a specification.

My present invention relates toa Stoker grate and consists more particularly in a novel construction and arrangement for securing the grate hars with respect to. the driving sprocket chain. v

llt further consists of a novel construction of grate har and novel means for securing it in position; A

@ther novel features o' construction and advantage will hereinafter more clearly ap'- fpear in the detailed description oi? my invention. i

For the purpose oi illustrating my invention, l have shown in the accompanying drawing typical embodiments of it which are atpresent preferred by me, since these embodiments will give in practice satisfactory and reliable results, although it is to he understoodthat the various instrumentalities oi which my invention consists can he variously arranged and organized and that my invention is not limited to the precise arrangement and organization of these instrumentalities as herein shown and de-` scribed.

Figure `1 represents, in side elevation,.a stoker grate embodying my invention, the sprocket wheel shaft being vshown in section.

Fig. 2 represents a section on line 2-2 of Fig. l.

Fig. 3 represents a section on line 3 3 oi Fig. 2.

Fig. 4 represents, in perspective, a novel fastening device employed.

Fig. 5 represents a sectional view of an other embodiment of' my invention.

Similar numerals of reference indicate corresponding parts.

Referring to the drawings'z- 1 designates a shaft on which a sprocket wheel 2 is fixed in any desired manner. 3 designates a sprocket chainvwhich is driven hy the sprocket wheel 2 in any desired or conventional manner. l designates the grate hars which are secured to a link 5 of the sprocket chain. ln the preferred' embodiment of my invention, the grate bars d are cast or formed with the downwardly projecting lugs 6, see Fig. 3, which are recessed, as indicated at 7, such recesses opening through the bottom of the lugs 6 and being preferably of a polygonal contour. 'in the form illustrated the walls of the recesses 7 are rectangular in order to receive the' rectangular shaped head 8 oi a fastening device 9 which is provided with a threaded rod or stem l0. The stem 10 passes through a vertically disposed aperture 11 in a grate har i and its threaded end extends into the countersunk portion 12 of the grate har and is provided with nuts 13, one of which serves as a lock nut. rllhe head 8 of the fastening device is provided with an aperture 1d eX- 'tending through it and through this aperture extends a pin 15 which also passes through a. link and is provided with a threaded portion 16 which is in threaded engagement with one of the links.

ln some cases, the grate har is made as seen in Fig. 5, in which the lug 17 is lformed separate from the grate har 18, and in practice the lug 17 is usually formed of a drop orging and is connected with the grate har 18 by means ci? the pins 19 which are 'castv in the grate bar 18 when the latter is completed, it being understood that the grate hars are :First formed and the pins 19 are passed through the grate har and screwed into the lugs 17. rlhe metal is then poured in to set the pins in the grate har, as will he understood hy reference to Fig. 5, it being understood that recesses are left in the grate bar until after the pins are in position and then the metal is poured in to finish the grate bar.

lt will be apparent that if at any time it is desired to remove a grate har for any reason, this can be readily accomplished by removing the nuts 13, whereupon the grate har d can be readily removed and a new grate bar secured to the sprocket chains.

ln the construction illustrated, the grate hars are adapted to overlap each other. lt is, however, to-he understood that my invention is not limited to any special construe# tion of grate lbar and may heemployed to advantagein conjunction vwith any desired or conventional type of grate har or sprocket chain.

lt has been customary in devices 'of this character as heretofore manufactured to make the lug of a drop forging and secure it to the grate bar. The grate har is secured to the sprocket, chain by means of a pin passing laterally therethrough and When it is desired to remove a grate bar, it is necessary to remove the pin. l This is a very difficult operation, since the pins become Warped and distorted due to the heat and the threads become stripped so that in many cases in practice it it necessary to put the stoker out of commission in order to change the grate bar. My present invention obviates such defects.

It will now be apparent that I have deviseel4 a novel and useful stoker grate, Which embodies the features of advantage enumerated .as desirable in the statement of the invention and the above Fdescription, and While I have, in the present instance, shown and described typical embodiments of it which will give 1n practice satisfactory and relimy invention, what combination with grate bars having at their ends bottom lugs "with recesses in their under side and provided with apertures communicating with said recesses and countersunk at their upper ends, of fastening devices having heads to seat in said recesses and stems te pass through said apertures, nuts in' threaded engagement with said stems, sprocket chains, and pins extending laterally through said sprocket chains and through the heads .of said fastening devices.

2. In a device of the ,character stated, the combination with the grate bars having lugs provided with polygonal shaped recesses, of

fastening devices having polygonal shaped heads to seat in said recesses and stems passing through said grate bars, means carried by said stems to secure said fastening devlces to said grate'bars, a sprocket chain,

and pins in threaded engagement Withusaid sprocket chain and' passingl through said lheads to secure said heads chain. l

FRANK J. REMMLEIN. Witnesses:

I-I. S. FAIRBANKS, C. D. MoVAr.

to said sprocket i 

